Tupsimati is:
Same elemental magic as weather: Enmity-20
The Acc/MAcc/MAB that follow after it aren't weather specific, SE needs to hire better people to word things in this game.
(Also Hailstorm is +10% damage, not +10MAB)
Enhances "Storm" spells is currently reserved for pushing them up to double weather level.
Otherwise that's probably a better way of dealing with such a thing, depending on how strong the added effect would be, having really strong buffs limited only to Storm recast would be a tad unbalanced; unless they stick it on Tupsimati.